I've been taking Niacin for the past 2 weeks but have not been taking them consistently. I've upped my dosage to 5k mg a day but only for the last 2 days. The theory is that you take as much as needed but there are no definitive answers as to what the limits are. Just wanted to know if any of you have had any positive effects with Niacin. I'm taking the no flush liquid version for now. I've had no side effects but will continue to monitor.